Preparation method of V2(PO4)O/C material, negative electrode of lithium ion battery, prepared from V2(PO4)O/C material prepared thereby and method for preparing negative electrode
A lithium-ion battery and negative electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as no precedent, and achieve the effects of low production cost, simple and easy-to-control methods, and excellent reversible capacity.
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[0028] The present invention provides a V 2 (PO 4 ) The preparation method of O / C material, comprises the following steps:
[0029] (1) Vanadium pentoxide and oxalic acid are dissolved in deionized water according to the proportion, and stirred for 1 hour under oil bath conditions to form a blue transparent solution. Subsequently, ammonium dihydrogen phosphate and glucose were sequentially added and stirred until the solution was homogeneous. The temperature of the oil bath is 60℃-100℃, and the molar concentration of vanadium pentoxide is 0.05-0.08mol L -1 . The feeding ratio of vanadium pentoxide, oxalic acid, and ammonium dihydrogen phosphate is: V 2 O 5 :H 2 C 2 O 4 ·2H 2 O:NH 4 H 2 PO 4 =1:3:1. Wherein, glucose and ethylene glycol can be allocated in appropriate amount. Generally, the amount of glucose is 0.6-2 times the mass of vanadium pentoxide, and the volume fraction of the ethylene glycol in the mixed solution is 3%-6%.
[0030] (2) Put the mixed soluti...
Example
[0040] first embodiment
[0041] Put 0.752g of V 2 O 5 (vanadium pentoxide) and 1.512 g of H 2 C 2 O 4 (oxalic acid) was dissolved in 70 mL of deionized water and stirred in an oil bath at 70°C for 60 minutes. Then 0.46g of NH was added sequentially 4 H 2 PO 4 (Ammonium dihydrogen phosphate) and 0.6g of glucose, each time after adding the medicine, stir for 5 minutes to ensure that the medicine is fully dissolved and mixed evenly. Then, 3 mL of ethylene glycol (EG) was added to the reaction system, and the solution was further stirred for 10 min. Finally, the solution was transferred into a 100 mL polytetrafluoroethylene hydrothermal liner, and sealed in a stainless steel hydrothermal kettle. Under the condition of hydrothermal reaction for 10 hours. The product after hydrothermal reaction was dried at 80°C for 10 hours, then pre-sintered at 350°C for 4 hours, and finally sintered at 750°C for 8 hours to obtain the final product V 2 (PO 4 ) O / C.
[0042] The batter...
Example
[0045] Second Embodiment
[0046] Combine 0.752g of V2O5 and 1.512g of H 2 C 2 O 4 (oxalic acid) was dissolved in 70 mL of deionized water and stirred in an oil bath at 100°C for 60 minutes. Then 0.46g of NH was added sequentially 4 H 2 PO 4 (ammonium dihydrogen phosphate) and 1g of glucose, stir for 5 minutes after each addition of the drug to ensure that the drug is fully dissolved and mixed evenly. Then, 2 mL of ethylene glycol (EG) was added to the reaction system, and the solution was further stirred for 10 min. Finally, the solution was transferred into a 100 mL polytetrafluoroethylene hydrothermal liner and sealed in a stainless steel hydrothermal kettle. Under the condition of hydrothermal reaction for 20 hours. The product after hydrothermal reaction was dried at 80°C for 15 hours, then pre-sintered at 350°C for 4 hours, and finally sintered at 750°C for 8 hours to obtain the final product V 2 (PO 4 ) O / C.
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